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A message that you sent could not be delivered to one or more of its
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  alwilliams@dawnltd.co.za
    host dawnltd.co.za [197.242.150.97]
    SMTP error from remote mail server after RCPT TO:<alwilliams@dawnltd.co.za>:
    550-Please turn on SMTP Authentication in your mail client.
    550-omr23.orchid.atmailcloud.com [13.251.146.0]:60790 is not permitted to relay
    550 through this server without authentication.
  alwynmd@eskom.co.za
    host mx1.eskom.seagatestoragecloud.co.za [169.239.240.92]
    SMTP error from remote mail server after RCPT TO:<alwynmd@eskom.co.za>:
    550-Callout verification failed:
    550 550 5.1.1 User unknown
  alwynd@vodamail.co.za
    host mx1.vodamail.co.za [196.11.146.148]
    SMTP error from remote mail server after RCPT TO:<alwynd@vodamail.co.za>:
    550 5.1.1 <alwynd@vodamail.co.za>: Recipient address rejected:
    User unknown in local recipient table
  alwynd@hibron.com
    host mail.hibron.com [134.0.13.61]
    SMTP error from remote mail server after RCPT TO:<alwynd@hibron.com>:
    550 5.1.1 <alwynd@hibron.com>: Recipient address rejected:
    User unknown in virtual mailbox table
  alwyn.burger@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<alwyn.burger@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  alworks@mweb.co.za
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<alworks@mweb.co.za>:
    550 rejected because recipient verify failed -- user not found
  ALWINT@MWEB.CO.ZA
    host securemail-mx3.synaq.com [196.35.198.130]
    SMTP error from remote mail server after RCPT TO:<ALWINT@MWEB.CO.ZA>:
    550 rejected because recipient verify failed -- user not found
  alwin@treasury.gov.za
    host treasury-gov-za.mail.protection.outlook.com [104.47.9.36]
    SMTP error from remote mail server after RCPT TO:<alwin@treasury.gov.za>:
    550 5.4.1 Recipient address rejected: Access denied. AS(201806281) [VE1EUR03FT061.eop-EUR03.prod.protection.outlook.com]
  alwyn@premiervalves.co.za
    host aspmx.l.google.com [142.250.4.27]
    SMTP error from remote mail server after RCPT TO:<alwyn@premiervalves.co.za>:
    550-5.1.1 The email account that you tried to reach does not exist. Please try
    550-5.1.1 double-checking the recipient's email address for typos or
    550-5.1.1 unnecessary spaces. Learn more at
    550 5.1.1  https://support.google.com/mail/?p=NoSuchUser v70si17569806pgd.190 - gsmtp